Search found 35 matches

by lukezhang2C
Tue Feb 12, 2019 10:21 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Equations
Replies: 2
Views: 20

Equations

Which equations would be good to memorise for the midterm?
by lukezhang2C
Tue Feb 12, 2019 10:20 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Midterm #1 14B
Replies: 14
Views: 130

Re: Midterm #1 14B

I don't see any other worksheets posted :(
by lukezhang2C
Fri Jan 18, 2019 11:03 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Ka vs. Kb
Replies: 11
Views: 55

Re: Ka vs. Kb

Ka and Kb are just used for acid/base dissociation, and Kc is just the equilibrium concentration.
by lukezhang2C
Fri Jan 18, 2019 11:00 am
Forum: Ideal Gases
Topic: Chemistry Community Posting
Replies: 7
Views: 52

Chemistry Community Posting

Should we finish our three posts before our discussion date or before/on Friday?
by lukezhang2C
Fri Jan 18, 2019 10:59 am
Forum: Ideal Gases
Topic: Homework Week 2
Replies: 10
Views: 71

Re: Homework Week 2

Homework will now be due in discussion!
by lukezhang2C
Sat Dec 08, 2018 12:06 am
Forum: Ionic & Covalent Bonds
Topic: Test bank?
Replies: 9
Views: 110

Re: Test bank?

Anyone have any past final exam questions from Lavelle from the test bank?
by lukezhang2C
Sat Dec 08, 2018 12:00 am
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: strong vs weak acids
Replies: 5
Views: 35

Re: strong vs weak acids

Electronegativity is also a factor to consider!
by lukezhang2C
Fri Dec 07, 2018 11:59 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Oxygen atoms in acid structures?
Replies: 3
Views: 33

Re: Oxygen atoms in acid structures?

I'm guessing it's because this would make the molecule larger while also making it more electronegative, which makes it a stronger acid, but I'm not 100% sure.
by lukezhang2C
Fri Dec 07, 2018 11:56 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Factors for Acid Stength [ENDORSED]
Replies: 3
Views: 57

Re: Factors for Acid Stength [ENDORSED]

The more electronegative the atom is the stronger the acid due to the strong ionic nature of their electron-sharing nature!
by lukezhang2C
Fri Nov 30, 2018 1:57 pm
Forum: Administrative Questions and Class Announcements
Topic: How to find my posts
Replies: 28
Views: 15253

Re: How to find my posts

I believer you can have email notifications, but I'm not sure how practical that would be.
by lukezhang2C
Fri Nov 30, 2018 10:59 am
Forum: Air Pollution & Acid Rain
Topic: Acid Rain on the Final
Replies: 4
Views: 61

Acid Rain on the Final

Will we have to memorise the exact chemical reaction equation for acid rain?
by lukezhang2C
Fri Nov 30, 2018 10:39 am
Forum: Air Pollution & Acid Rain
Topic: Acid Rain
Replies: 9
Views: 434

Re: Acid Rain

The water molecules in rain react with pollutants in the air and becomes acidic in nature
by lukezhang2C
Fri Nov 30, 2018 10:38 am
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: pH formula
Replies: 5
Views: 187

Re: pH formula

They might give us a new equation sheet but I'm pretty sure you're just supposed to memorise it.
by lukezhang2C
Fri Nov 30, 2018 10:37 am
Forum: Formal Charge and Oxidation Numbers
Topic: TEST 3
Replies: 4
Views: 74

Re: TEST 3

I would not think so, though it's a relatively simple formula so they might expect you to memorise it.
by lukezhang2C
Fri Nov 30, 2018 10:36 am
Forum: Sigma & Pi Bonds
Topic: Sigma and Pi bonds
Replies: 5
Views: 57

Re: Sigma and Pi bonds

Most likely nothing computational as we don't know enough to do that, I would assume just labeling would work
by lukezhang2C
Fri Nov 30, 2018 10:35 am
Forum: Calculating the pH of Salt Solutions
Topic: Ka Constant
Replies: 4
Views: 38

Ka Constant

Do we need to know how to calculate the Ka equilibrium of acid/base reactions?
by lukezhang2C
Sat Nov 17, 2018 1:56 am
Forum: Sigma & Pi Bonds
Topic: Sigma v. Pi
Replies: 6
Views: 143

Re: Sigma v. Pi

Sigma bonds result from overlapping end-end atomic orbitals while pi bonds are overlapping side to side in a perpendicular plane.
by lukezhang2C
Sat Nov 17, 2018 1:53 am
Forum: Hybridization
Topic: Test 3
Replies: 5
Views: 84

Re: Test 3

His outline would give all necessary information, and he would probably email us as well soon!
by lukezhang2C
Sun Nov 04, 2018 9:58 pm
Forum: Electronegativity
Topic: Periodic Trends
Replies: 10
Views: 140

Re: Periodic Trends

For Atomic Radius it increases as it goes down due to the added number of shells to house the electrons
by lukezhang2C
Sun Nov 04, 2018 9:57 pm
Forum: Electronegativity
Topic: MIDTERM
Replies: 5
Views: 67

Re: MIDTERM

Will we be given the electronegativity difference numbers for non-obvious cases of covalent or ionic bonding?
by lukezhang2C
Sun Nov 04, 2018 9:56 pm
Forum: Ionic & Covalent Bonds
Topic: Test bank?
Replies: 9
Views: 110

Re: Test bank?

The Bruin Online Testbank has previous chem 14A exams too but not from Lavelle
by lukezhang2C
Thu Oct 25, 2018 10:18 pm
Forum: Photoelectric Effect
Topic: Conditions that allow electron to be ejected from metal surface
Replies: 12
Views: 183

Re: Conditions that allow electron to be ejected from metal surface

Will the work function of the metal be given when doing problems?
by lukezhang2C
Thu Oct 25, 2018 10:15 pm
Forum: Properties of Light
Topic: Test 2
Replies: 7
Views: 201

Re: Test 2

Which equations do we have to memorise vs which ones are on the equation sheet?
by lukezhang2C
Thu Oct 25, 2018 10:14 pm
Forum: Einstein Equation
Topic: Units
Replies: 10
Views: 178

Re: Units

It should follow e=mc^2 for photons, which is kgm^2/s^2
by lukezhang2C
Thu Oct 18, 2018 6:57 pm
Forum: Properties of Electrons
Topic: Diffraction patterns
Replies: 9
Views: 108

Re: Diffraction patterns

Constructive interference simply means that an addition of the two waves results in a larger amplitude, while destructive interference is the opposite. The two are not mutually exclusive and can be in conjunction with one another.
by lukezhang2C
Thu Oct 18, 2018 6:55 pm
Forum: Properties of Electrons
Topic: Energy v. Kinetic Energy
Replies: 3
Views: 55

Re: Energy v. Kinetic Energy

Electrons have different properties than photons, and while it is near massless, it is often not considered as such when solving for kinetic energy which is why the same kinetic energy equations which work for photons do not work for electrons.
by lukezhang2C
Thu Oct 18, 2018 6:53 pm
Forum: Properties of Light
Topic: Wavelength and frequency proportions [ENDORSED]
Replies: 5
Views: 115

Re: Wavelength and frequency proportions [ENDORSED]

The two have an inversely proportional relationship, this property is just derived from the formula!
by lukezhang2C
Thu Oct 11, 2018 11:12 pm
Forum: Administrative Questions and Class Announcements
Topic: Number of questions on test one [ENDORSED]
Replies: 39
Views: 16716

Re: Number of questions on test one [ENDORSED]

Does anyone know if there will be a periodic table provided for us?
by lukezhang2C
Thu Oct 11, 2018 11:10 pm
Forum: SI Units, Unit Conversions
Topic: formula units [ENDORSED]
Replies: 68
Views: 20131

Re: [ENDORSED]

Simran Athwal-Dis 3A wrote:Hi, I had a quick question. How do we check how many times we posted on Chemistry Community? Do we go on our profile?


I think theres an option in profile which shows your posts!
by lukezhang2C
Thu Oct 11, 2018 11:08 pm
Forum: Administrative Questions and Class Announcements
Topic: Number of questions on test one [ENDORSED]
Replies: 39
Views: 16716

Re: Number of questions on test one [ENDORSED]

Diana Chavez 1K wrote:If we do not understand what a question on the test asks is it allowed to ask for clarity from our TA's?

I think in general during testing they're not really allowed to answer these types of questions unless it's a glaring wording error.
by lukezhang2C
Mon Oct 01, 2018 12:57 pm
Forum: Significant Figures
Topic: Significant Figures [ENDORSED]
Replies: 6
Views: 84

Re: Significant Figures [ENDORSED]

Significant figures allows us to measure the precision of our measurement instruments!
by lukezhang2C
Mon Oct 01, 2018 12:54 pm
Forum: SI Units, Unit Conversions
Topic: Week 1 Homework Assignment [ENDORSED]
Replies: 16
Views: 316

Re: Week 1 Homework Assignment [ENDORSED]

Yep! You do any seven problems from the assigned problems and turn it in.
by lukezhang2C
Mon Oct 01, 2018 1:58 am
Forum: SI Units, Unit Conversions
Topic: Homework Grading Clarification [ENDORSED]
Replies: 7
Views: 148

Homework Grading Clarification [ENDORSED]

So for the homework we turn in, do we pick seven problems from the list on the syllabus or should we turn in our answers to all of the problems but the TAs would only grade seven of them?

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